Linked Life Data

8620527

Source:http://linkedlifedata.com/resource/pubmed/id/8620527

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1996-6-14
pubmed:databankReference
pubmed:abstractText
Abstract Interferon gamma (IFNgamma) is an important cytokine with immunomodulatory properties that include activation of immune cells and induction of class I and class II major histocompatibility complex antigens. In this study a retroviral vector was used to introduce the IFNgamma gene into EMT6 tumor cells to assess the effect of IFNgamma gene expression on tumor immunogenicity. Transfectants were selected in G418-containing tissue-culture medium and were determined to express the inserted IFNgamma gene by reverse transcriptase/polymerase chain reaction. Flow-cytometric analysis revealed that parental unmodified EMT6 cells constitutively expressed only class I MHC and were poorly responsive to exogenous IFNgamma stimulation, whereas class II MHC was induced in IFNgamma-transfected cells. The induction of class II MHC in IFNgamma-transfected cells correlated with the expression of a mouse class II transactivator gene that was dormant in unmodified or mock-transfected cells. In addition, IFNgamma-gene-transfected tumor cells were found to secrete up to 17 ng IFN (equivalent to 75 units/10(6) cells) by enzyme-linked immunosorbent assay (ELISA). Whereas parental EMT6 cells grew unchecked, the growth of genetically modified tumor cells was significantly inhibited in immunocompetent mice. Rechallenge of animals that rejected an IFNgamma-transfected EMT6 clone (EMT6-B17) with parental EMT6 cells resulted in tumor rejection, suggesting that IFNgamma-transfected EMT6 cells were able to induce long-term immunity. Mixing experiments using gene-transfected and unmodified tumor cells demonstrated that 10% of IFNgamma-transfected cells in the population was sufficient to protect mice against subsequent challenge with tumorigenic EMT6 cells. These studies demonstrate that the immunogenicity of tumor cells that are poorly responsive to exogenous IFNgamma can be enhanced by inserting and expressing the IFNgamma transgene. These findings also suggest a role for class II MHC in reducing tumorigenicity of the EMT6 tumor and inducing long-term tumor immunity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0340-7004
pubmed:author
pubmed:issnType
Print
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
99-107
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:8620527-Animals, pubmed-meshheading:8620527-Base Sequence, pubmed-meshheading:8620527-Cell Division, pubmed-meshheading:8620527-Female, pubmed-meshheading:8620527-Gene Expression, pubmed-meshheading:8620527-Gene Therapy, pubmed-meshheading:8620527-Gene Transfer Techniques, pubmed-meshheading:8620527-Histocompatibility Antigens Class I, pubmed-meshheading:8620527-Histocompatibility Antigens Class II, pubmed-meshheading:8620527-Humans, pubmed-meshheading:8620527-Immunity, Innate, pubmed-meshheading:8620527-Interferon-gamma, pubmed-meshheading:8620527-Mammary Neoplasms, Experimental, pubmed-meshheading:8620527-Melanoma, Experimental, pubmed-meshheading:8620527-Mice, pubmed-meshheading:8620527-Mice, Inbred BALB C, pubmed-meshheading:8620527-Molecular Sequence Data, pubmed-meshheading:8620527-Nuclear Proteins, pubmed-meshheading:8620527-Stimulation, Chemical, pubmed-meshheading:8620527-Trans-Activators
pubmed:year
1996
pubmed:articleTitle
Interferon gamma (IFNgamma) gene transfer of an EMT6 tumor that is poorly responsive to IFNgamma stimulation: increase in tumor immunogenicity is accompanied by induction of a mouse class II transactivator and class II MHC.
pubmed:affiliation
Department of Microbiology and Immunology, University of Arizona, Tucson, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't